Jütlandmuschel

The Jütlandmuschel is a freshwater mussel whose limited known distribution turns it into a geographic clue in the murder investigation: identifying it helps narrow the waters associated with the evidence, though it does not establish a single source.

Identification

Björn Holm consults a limnologist to identify the mussel. The answer is the Jütlandmuschel, described as the smallest pond-mussel species known so far and one found only in Norway. The exchange distinguishes it from an unspecified freshwater shell: it is a particular species with a restricted known range.

Candidate Waters

The identification produces two candidate waters. The investigators describe them as neighboring waters, and Lyseren Area is named as one possibility. The evidence therefore narrows the search geographically without resolving which of the two waters is relevant.

Investigative Significance

The Jütlandmuschel matters not as an animal encountered in its habitat, but as an identifying trace: a limnological consultation converts a shell clue into a limited set of possible locations. The clue advances the inquiry while leaving an essential uncertainty intact—the species points toward candidate waters, not a definitive origin.